Trane xl (home) condensor does not always run in heat

I have a trane xl AC and in the hottest part of the day the condensor
will not come on, or if it does come on it will stay on for a while, go
off, then try to come on again, but it never turns back on. It will
start to come on then simply stop. When the day cools down to around 88
degress, vs 100, it will come on and stay on. Is this because the coil
is freezing? I am not sure why in the hottest part of the day the A/C
condensor won't come on. The fan stays on but the part doing the
cooling won't come on.
thanks,
glen

Moe,
The thing is the unit is relatively new, 2 years. It is a 4 ton system
paired with a trane furnace. The other thing is after 5:30 last night
it came on fine. It runs as long as I want after the temperature
outside drops. What kind of problem could this be? I would call a
contractor but I want to get an idea of what type of issue could cause
this. It runs FINE after it is < 90 degrees, approximatly, outside.
glen

It could be anything but I would advise you to shut it down until the A/C
technician can check it out.
The reason for shutting it down is to not cause any further damage to your
system and when the tech comes out and finds the compressor hot and off on
internal overload it makes his or her job harder which cost you more money.

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